Mechanical hammer



July 5, 1949. c. MON'II'OYA 2,475,398

MECHANI CAL HAMMER Filed June 24, 1947 2 Sheets-Sheet l F/g.l.

W W m W m w I n uerz tor Carlos Montoya July 5, 1949. c. MONTOYA 2, 9

MECHANICAL HAMMER Filed June 24, 1947 2 Sheets-Sheet 2 I u ventor Car/0s Montoya Patented July 5, 1949 UNITED STATES PATENT OFFICE MECHANICAL HAMMER Carlos Montoya, Belen, N. Mex.

Application June 24, 1947, Serial No. 756,583

2 Claims.

The present invention relates to new and useful improvements in mechanical hammers and more particularly to power operated means for raising a hammer and releasing the hammer at the completion of its upstroke together with spring means exerting its influence on the hammer to deliver a blow on the work held on an anvil under the hammer.

An important object of the present invention is to provide a power-operated hammer of this character including an electric motor operatively connected to the hammer for raising the latter and a foot controlled switch for the motor to thus leave the hands. of the-operator free for holding the work in the path of the, hammer.

A further object of the invention is to provide novel engaging and releasing means between a power operated lift arm and a shank of the hammer to place the hammer under the influence of the spring for the delivery of the hammer blow.

A still further object of the invention is to provide an apparatus of this character of simple and practical construction, which is efficient and reliable in operation, relatively inexpensive in manufacture, and otherwise well adapted for the purposes for which the same is intended.

Other objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings, forming part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a side elevational view;

Figure 2 is an enlarged vertical sectional view of the guide for the upper end of the hammer;

Figure 3 is a horizontal sectional view taken on a line 3-3 of Figure 1;

Figure 4 is a similar view taken on a line 4-4 of Figure 1;

Figure 5 is a sectional view through the table taken on a line 55 of Figure 1 and showing the anvil;

Figure 6 is a fragmentary perspective view of the hammer releasing finger for the lift arm; and

Figure 7 is an enlarged sectional view taken on a line 1-4 of Figure 1 and showing the adjustable connection between the pitman arm and the lift arm.

Referring now to the drawings in detail wherein for the purpose of illustration I have disclosed a preferred embodiment of the invention, the numeral 5 designates a table preferably in the form of an I beam supported at each end on legs 6.

A pair of posts I have their lower ends welded or otherwise suitably secured to the opposite sides of the table and extend upwardly therefrom in spaced parallel relation'with respectto each other. A lift arm 8 is positioned between the posts 1 and is pivoted intermediate its ends to the post by a pin e.

To the rear end of the lift arm 8 is pivoted a pair of pitmen rods 10 by means of L-shaped brackets H each having its vertical portion pivted to the lift arm 8 bya belt or pin 2 and hav ing its horizontal portion secured to the upper end of the pitman rod 10- by upper and lower nuts l3 and M threaded on the upperend of the pit man rod to thus provide for a vertical adjustment of the pitman rod relative to the lift arm.

The lower end-of one pitman rod [0 is pivoted eccentrically to a gear wheel 15 secured at one end of a shaft 5a which is journaled in a bearing bracket I-Ba on a support I 6 rising from the table 5. The lower-end of the other pitman rod is pivoted eccentrically to a wheel 15b secured to the other end of shaft 150.. The gear wheel 15 is driven by a gear I! of reduced ratio secured at one end of a shaft l8 whichis journaled transversely in a bearing bracket: l9 secured to they support l6. A pulley 20 is secured to the other end of the shaft l8 and is driven by a belt 2| from an electric motor 22 which is mounted at the rear end of the table 5. The motor is controlled by a switch 23 operated by a foot pedal 24 which is hinged at one end as shown at 25 to a fioor at the front of the table 5, the free end of the foot pedal overlying the switch.

A finger 26 is bifurcated or formed with a yoke 21 at its inner end for pivotally mounting on the front end of the lift arm 8 for horizontal swinging movement by means of a pin 28 extending vertically through the arm. The finger 26 is held against one side of a vertically reciprocating hammer 29 by means of a coil spring 30 extending longitudinally along the lift arm 8 and attached at its rear end to the pin 9 and attached at its front end to a plate 3| projecting horizontally from the finger 26 as shown more clearly in Figure 6 of the drawings.

The side of the finger 26 adjacent the hammer 29 and at the outer end of the finger is inclined or beveled as shown at 32 and the finger is held under a shoulder 33 formed at the upper edge of a recess 34 in the side of the hammer 29 by the spring 30.

The upper end of the hammer 29 is slidable in a vertical sleeve 35 supported at the upper ends of the posts 1 by braces 36, this sleeve having an annular flange 31 at its lower end. 'A disc 38 is secured to the upper end of the hammer above the sleeve and a plurality of coil springs 39 are connected at their upper ends to the disc and connected at their lower ends to the flange 31, the springs being placed under tension by an upward movement of the hammer to thus exert a downward pulling force on the hammer at the completion of its upstroke.

A head 49 is welded or otherwise suitably secured to the lower end of the hammer 29 and to the top of the table at its front end is secured an anvil 4! by means of a pair of plates 42 secured to the opposite sides of the table 5 by bolts 43. The anvil is preferably of semi-cylindrical construction with its rounded surface uppermost.

In the operation of the device, the work is held on the anvil 4i and the switch 23 closed by the foot pedal 24 whereupon the motor 22 will be energized to drive the gear l5 to thus raise and lower the pivoted lift arm 8.

As the front end of the arm 8 is raised the finger 26 engaged under the shoulder 33 will also raise the hammer 29 to place the springs 39 under tension. As the arm 8 and finger 26 swing upwardly the beveled or inclined outer end 32 of the finger will be drawn in a rearward direction as shown by the dotted lines in Figure 1 into engagement with the shoulder 33 and inclined edge 32 will cause the finger to swing horizontally away from the hammer 29 and out of engagement with the shoulder 33 whereby to release the hammer and cause the head 40 to strike a sharp blow on the work. The spring 30 will hold the finger 25 against the side of the hammer 29 so that as the arm 8 and finger 26 are lowered, the finger will again engage under the shoulder 33 to lift the hammer and repeat the operation.

In view of the foregoing description taken in consideration with the accompanying drawings it is believed that a clear understanding of the device will be quite apparent to those skilled in this art. A more detailed description is accordingly deemed unnecessary.

It is to be understood, however, that even though there is herein shown and described a preferred embodiment of the invention the same is susceptible to certain changes fully comprehended by the spirit of the invention as herein described and the scope of the appended claims.

Having thus described the invention what is claimed as new is:

1. A mechanical hammer comprising a reciprocably actuated striking member, power operated means for raising said member, spring means placed under tension by the raising of the member and exerting a downward force on the member, said striking member having a notch in one side, and said first named means including a vertically swingable arm and a horizontally swingable finger at one end of the arm engaged in the notch and automatically cammed out of said notch during raising of said member by downward force exerted against said member, whereby to release said member.

2. A mechanical hammer comprising a table, a post rising from the table, an arm pivoted to the post for vertical swinging movement, power operated means connected to the rear end of the arm, a guide supported on the post, a striking member slidable vertically in the guide, said striking member having a notch in one side, a finger pivoted horizontally on the front end of the arm, and spring means for swinging the finger laterally against the striking member for entering the notch, said finger having an inclined outer end normally free of the notch and coacting with the notch during upward sliding movement of the striking member to cam the finger away from said member and out of engagement with the notch, to thereby release said member.

CARLOS MONTOYA.

REFERENCES CITED The following referenlces are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 616,488 Souther Dec. 27, 1898 1,465,918 Redinger Aug. 21, 1923 

